---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 07/03/07: 9 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:53 AM - Re: Automatic Headlight Hi/Lo Fallover Circuit (TbirdRV) 2. 05:59 AM - Re: multi detent 10k potentiometer? (C Smith) 3. 06:00 AM - Re: AeroElectric-List Digest: 16 Msgs - 07/02/07 (Gary Casey) 4. 06:45 AM - Re: Re: Automatic upper cowl flap (Larry Mac Donald) 5. 07:13 AM - Re: Automatic upper cowl flap (Larry Mac Donald) 6. 09:16 AM - Dual batteries with single alternator () 7. 09:39 AM - Re: Dual batteries with single alternator (Robert L. Nuckolls, III) 8. 12:17 PM - Re: Automatic upper cowl flap (Carlos Trigo) 9. 06:02 PM - Re: Automatic upper cowl flap (Ralph Hoover) ________________________________ Message 1 _____________________________________ Time: 03:53:17 AM PST US Subject: AeroElectric-List: Re: Automatic Headlight Hi/Lo Fallover Circuit From: "TbirdRV" Hi Eric, I would like to see your "back-of-the-envelope" design. What do you mean "by adding one simple wire"? Just a jumper from the high to low beam at the lamp, or another wire from a switch in the cockpit. I'd like to hear your ideas. At some point I will install LED headlights, probably after it's "plug-n-play". Thanks, -------- ~~~~~~~~~~~~~~~~~~~~~~~ Tony Kirk RV-6A N57TK www.TomsRV8.com webmaster www.EAA582.org Read this topic online here: http://forums.matronics.com/viewtopic.php?p=121950#121950 ________________________________ Message 2 _____________________________________ Time: 05:59:39 AM PST US From: "C Smith" Subject: RE: AeroElectric-List: multi detent 10k potentiometer? Automotive application fan controls may not be a viable solution. Some use a wire resistive element with taps remotely positioned in the heater airbox. I found this out when a mouse decided to build a nest in mine. When the fan was turned on to a position other than "HIGH" something would start smoking. After tearing apart he duct work, I found the nest, removed it, then the side of my arm got burned on the wire element that was exposed inside the box. CS -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of bakerocb@cox.net Sent: Sunday, July 01, 2007 7:52 AM Subject: AeroElectric-List: multi detent 10k potentiometer? 7/1/2007 Hello cj, I recently drove a Chevrolet Malibu rental car that had a click knob rheostat to control the fan speed on the air flow to the car interior. The knob itself was probably too large for your use, but you might check with the parts section of a local dealer to find out what the insides are. 'OC' Says: "The best investment we can make is the effort to gather and understand knowledge." Time: 02:53:23 PM PST US Subject: AeroElectric-List: multi detent 10k potentiometer? From: "Chris Johnston" Ok smart guys...get ready for a dumb guy question! What do you call a regular old 10k pot that has multiple detents on it? I'm trying to find a single turn 10k pot that has a click feel, maybe 20 detents or so, to use with a PWM dimming system for an lcd inverter. But I have no idea what to call it! so I can't look for it! I tried and tried, but all I find is pots with center detents, or pots with a switch at the end, but that's the only detent. I'm very frustrated, and feeling very stupid. Can someone smarter than me help me out? Btw, I do know what it's called when you cross a hippopotamus, an elephant and a rhino. Hellifiknow! Sorry. and thanks. cj #40410 www.perfectlygoodairplane.net ________________________________ Message 3 _____________________________________ Time: 06:00:56 AM PST US From: Gary Casey Subject: AeroElectric-List: Re: AeroElectric-List Digest: 16 Msgs - 07/02/07 I guess I have to ask the obvious(?) question - why are you worried about the temperature after shutdown? First, the engine is water cooled, so the majority of the mass is at a relatively low temperature. All the components are, or should be, designed for that temperature. What problem are you trying to solve? The weakest material is probably the cowl itself, but some thin insulation should help. I know that after shutdown when you touch the cowl it feels really hot, but so what? Just wondering. (the gravity-operated doors described seem to be the simplest "automatic" option) Gary Casey > > Thanks Charlie > > It's really a smart idea, with only one inconvenient. It will not > prevent > rain water entrance when the aircraft is parked outside. > I'll put it in my solutions list. If it doesn't work properly, I > still need > the electrical automation ... > > Carlos > > > ----- Original Message ----- > From: "Charlie England" > Sent: Monday, July 02, 2007 2:20 AM > Subject: Re: AeroElectric-List: Automatic upper cowl flap > > >> >> >> Carlos Trigo wrote: >>> >>> >>> Since I'm using a Subaru engine, I need to have some kind of >>> ventilation >>> exit on the upper cowling, to dissipate heat after engine >>> shutdown. Most >>> builders just make a row of 3/4" holes, and others put side >>> louvers that >>> look like shark guills. >>> I intend to make the upper row of holes, but don't want to let them >>> always open, due to the possibility of rain penetration and also >>> because >>> they can have a bad influence in the cooling air flow inside the >>> cowling. >>> Therefore I thought of a small (some 15" x 1 1/2") moving flap, >>> which >>> covers the holes, and is normally closed in flight. >>> >>> Now the electrical challenge, that I put here to the smart guys >>> of this >>> list: >>> The ideal solution to manouver this flap would be to >>> automatically open >>> it when the engine is turned off. How can it be done? >>> >>> Carlos >>> RV-9A >>> >>> P.S. - I know this is not a KIS solution... ________________________________ Message 4 _____________________________________ Time: 06:45:18 AM PST US Subject: Re: AeroElectric-List: RE: Automatic upper cowl flap From: Larry Mac Donald Well Carlos, I've been trying to find the Tony Bengelis solution. But havn't found it yet. I think he said it was a air plunger that operates a door on a Volkswagen. They use it as a sort of cowl flap. Tony used it as a real cowl flap. When the engine room gets hot the air in the cylinder gets hot and expands in the chamber and pushes the cylinder rod out. The rod pushes the flap open. HTH Larry Mac Donald lm4@juno.com Rochester N.Y. Do not archive On Mon, 2 Jul 2007 19:40:43 +0100 "Carlos Trigo" writes: > > > Thanks Glenn > > That is really a very clever solution. > > And where do you think I can get that "miraculous" bimetal spring? > Are those "calibrated" for the temperature we want it to actuate? > > Carlos ________________________________ Message 5 _____________________________________ Time: 07:13:15 AM PST US Subject: Re: AeroElectric-List: Automatic upper cowl flap From: Larry Mac Donald Carlos, I've found it. Firewall forward by Tony--Page 141 shows the "VW or Porsche air intake housing bellows" and measurments. Page 142 shows a picture of how it is hooked up. It even has an manual over-ride and a flap position indicator. Larry Mac Donald lm4@juno.com Rochester N.Y. Do not archive On Sun, 1 Jul 2007 18:20:31 +0100 "Carlos Trigo" writes: > > > Since I'm using a Subaru engine, I need to have some kind of ventilation exit on the upper cowling, to dissipate heat after engine shutdown. Most builders just make a row of 3/4" holes, and others put side louvers that look like shark guilds.I intend to make the upper row of holes, but don't want to let them always open, due to the possibility of rain penetration and also because they canhave a bad influence in the cooling air flow inside the cowling.Therefore I thought of a small (some 15" x 1 1/2") moving flap, which covers the holes, and is normally closed in flight.Now the electrical challenge, that I put here to the smart guys of this list: The ideal solution to maneuver this flap would be to automatically open it when the engine is turned off, which in this engine's case is to turn Off an electrical switch. How can it be done? Carlos RV-9A P.S. - I know this is not a KIS solution... ________________________________ Message 6 _____________________________________ Time: 09:16:35 AM PST US From: Subject: AeroElectric-List: Dual batteries with single alternator I am building a RV-7 with an all electric panel. I am considering using two batteries and one alternator. I am looking for a circuit to use the batteries isolated if there is a problem with the other or the alternator. I will probably have only a main bus and a batt bus. Thanks in advance. Ed ________________________________ Message 7 _____________________________________ Time: 09:39:07 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Dual batteries with single alternator At 11:14 AM 7/3/2007 -0500, you wrote: >I am building a RV-7 with an all electric panel. I am considering using >two batteries and one alternator. I am looking for a circuit to use the >batteries isolated if there is a problem with the other or the >alternator. I will probably have only a main bus and a batt bus. > >Thanks in advance. > >Ed Have you reviewed the materials at: http://aeroelectric.com/articles/Rev11/AppZ_R11J.pdf If you don't have a copy, I'll suggest that you acquire the AeroElectric Connection and review the chapter on system reliability. The optimal all electric system for weight, simplicity and cost of ownership is Figure Z-13/8 in the document cited above. Without knowing what engine you're planning, I'll suggest you start with that Figure. If it's a Subaru conversion, then a second alternator is not in the stars. Then you might consider Figure Z-19. Your concerns about "battery problems" are not well founded. Assuming you plan to actively monitor battery performance and replace when capacity falls below established limits, then you need nothing more sophisticated than a low voltage warning light and the architecture that allows you to position switches for comfortable termination of flight. Bob . . . ---------------------------------------- ( "Physics is like sex: sure, it may ) ( give some practical results, but ) ( that's not why we do it." ) ( ) ( Richard P. Feynman ) ---------------------------------------- ________________________________ Message 8 _____________________________________ Time: 12:17:41 PM PST US From: "Carlos Trigo" Subject: Re: AeroElectric-List: Automatic upper cowl flap Thanks Larry Another fellow lister ( Bill S ) already sent me a scan of those pages from Tony Bingelis' book. Thanks to everybody who responded. Carlos ----- Original Message ----- From: "Larry Mac Donald" Sent: Tuesday, July 03, 2007 3:09 PM Subject: Re: AeroElectric-List: Automatic upper cowl flap > > Carlos, > I've found it. > Firewall forward by Tony--Page 141 shows the "VW or Porsche air intake > housing bellows" and measurments. Page 142 shows a picture of how it is > hooked up. It even has an manual over-ride and a flap position indicator. > Larry Mac Donald > lm4@juno.com > Rochester N.Y. > Do not archive > > On Sun, 1 Jul 2007 18:20:31 +0100 "Carlos Trigo" > writes: >> >> >> Since I'm using a Subaru engine, I need to have some > kind of ventilation exit on the upper cowling, to dissipate > heat after engine shutdown. Most builders just make a > row of 3/4" holes, and others put side louvers that look > like shark guilds.I intend to make the upper row of holes, > but don't want to let them always open, due to the > possibility of rain penetration and also because they > canhave a bad influence in the cooling air flow inside the > cowling.Therefore I thought of a small (some 15" x 1 1/2") > moving flap, which covers the holes, and is normally > closed in flight.Now the electrical challenge, that I put > here to the smart guys of this list: The ideal solution to > maneuver this flap would be to automatically open it > when the engine is turned off, which in this engine's > case is to turn Off an electrical switch. > How can it be done? > Carlos > RV-9A > P.S. - I know this is not a KIS solution... > > > ________________________________ Message 9 _____________________________________ Time: 06:02:36 PM PST US From: Ralph Hoover Subject: Re: AeroElectric-List: Automatic upper cowl flap Here is one source of the VW Temperature control Bellows. http://www.bugcity.com/cgi-bin/WebStore/indexNEW.cgi/mi=yes/srchcd=111119159AX -- Ralph C. 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